u (d) Describe 11. IQ Scores The following frequency histogram re IQ scores of a
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u (d) Describe 11. IQ Scores The following frequency histogram re IQ scores of a random sample of seventh-grade students cnts measured to the nearest whole number. The frequen class is labeled above each rectangle the sllapu rl you ency ofe uni 13. IQs of 7th-Grade Students 14 70 58 50 42 40 31 30 20 10 0 13 60 70 80 90 100 110 120 130 140 150 160 IQ Scores (a) How many students were sampled? (b) Determine the class width. (c) Identify the classes and their frequencies (d) Which class has the highest frequency? (e) Which class has the lowest frequency? () What percent of students had an IQ of at least 130? (g) Did any students have an IQ of 165?Explanation / Answer
10)
According to given histograme
a)the most frequent number of car sold in this week is =4
b)2 cars were sold for = 9 weeks
c)
total number of week=4+2+9+8+12+8+5+2+1+1=52
number of week 2 cars were sold=9
so the percentage =9/52 *100=17.30%
d)since we have two clear pick in the histrograme
one for 2 car sold for 9 weeks and another for 4 cars sold for 12 weeks
so can say that this is a bimodel distribution
11) According to given histogram
a) number of student sampled=2+3+13+42+58+40+31+8+2+1=200
b)class width =difference between upper and lower class limit of consequitive class
=70-60=10
c)class and their freequencies are
d)class havin highest frequency is
100-110 with 58 students
e) class having lowest frequency is
150-160 with 1 student
f)Total number of student =200
number of student having IQ at least 130 =8+2+1=11
percentage of student having IQ at least 130 =11/200 *100=5.5%
g)
Accorddin to the diven table the maximum IQ that a student have is 160
so there is no one with 165 of IQ
class frequency 60-70 2 70-80 3 80-90 13 90-100 42 100-110 58 110-120 40 120-130 31 130-140 8 140-150 2 150-160 1Related Questions
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